NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Monitor Tester
What should be paid attention to during the test of the cable fault tester The cable fault tester is used to test the open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance leakage faults of power cables , and what to pay attention to during the test of the cable fault tester The cable fault tester is used to test the open circuit, short circuit, grounding, low resistance, high resistance flashover and high resistance of power cables Leakage faults, as well as open and short fault test cables for coaxial communication cables and local telephones. You can also test cable paths, burial depth and radio wave speed measurements, verify cable lengths, etc., and establish cable documentation for routine maintenance management. Cable fault testers use the principle of time domain reflection to send a series of electrical pulses to the cable under test and receive the reflected pulses caused by changes in the cable impedance, which are then represented in terms of the cable's speed of propagation.
The characteristic inflection point of the electric wave and the two reflected waves in the cable. Time, can measure the distance from the fault point to the test terminal. Precautions when using: 1. During the pulse method test, please take care to throw off all the equipment in the office and measure on the outside.
2. When using the flashover method for testing, be sure to set the trigger working mode switch to“Flashover”Location. 3. When using the direct flash method or flash method for testing, please pay attention to personal safety and equipment safety. Be sure to connect the ground wire.
4. After the flashover method test is completed, cut off the power supply, unplug the connecting wire between the instrument and the high-voltage test equipment, and then release the charge stored in the high-voltage capacitor and cable. When discharging, a current limiting resistor R should be added to limit the discharge current to discharge slowly. After the voltage on the capacitor has dropped, the resistance in the discharge circuit goes straight to zero.
equipment or personal accident. 5. During the direct flash test, be sure to monitor the leakage current of the fault. If there is a sudden increase in current and no fault flashover occurs, the test voltage should be lowered immediately and a flash test should be used.
The smoothness and power delivery of a cable fault tester system depends on the proper operation of the cable line. Once the line is blocked, it will cause communication and power interruption. If the failure cannot be detected in time and eliminated quickly, it will cause huge economic losses and adverse social impacts.
Therefore, maintenance personnel should pay attention to ensure the normal operation of the cable fault tester during the work process.
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